linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix UAF issue in f2fs_merge_page

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Message-Id: 
 <175918503274.1733438.18125084752996627880.git-patchwork-notify@kernel.org>
Date: Mon, 29 Sep 2025 22:30:32 +0000
From: patchwork-bot+f2fs@...nel.org
To: Chao Yu <chao@...nel.org>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org, JY.Ho@...iatek.com,
 linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix UAF issue in f2fs_merge_page_bio()

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@...nel.org>:

On Sun, 28 Sep 2025 18:24:22 +0800 you wrote:
> As JY reported in bugzilla [1],
> 
> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
> pc : [0xffffffe51d249484] f2fs_is_cp_guaranteed+0x70/0x98
> lr : [0xffffffe51d24adbc] f2fs_merge_page_bio+0x520/0x6d4
> CPU: 3 UID: 0 PID: 6790 Comm: kworker/u16:3 Tainted: P    B   W  OE      6.12.30-android16-5-maybe-dirty-4k #1 5f7701c9cbf727d1eebe77c89bbbeb3371e895e5
> Tainted: [P]=PROPRIETARY_MODULE, [B]=BAD_PAGE, [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
> Workqueue: writeback wb_workfn (flush-254:49)
> Call trace:
>  f2fs_is_cp_guaranteed+0x70/0x98
>  f2fs_inplace_write_data+0x174/0x2f4
>  f2fs_do_write_data_page+0x214/0x81c
>  f2fs_write_single_data_page+0x28c/0x764
>  f2fs_write_data_pages+0x78c/0xce4
>  do_writepages+0xe8/0x2fc
>  __writeback_single_inode+0x4c/0x4b4
>  writeback_sb_inodes+0x314/0x540
>  __writeback_inodes_wb+0xa4/0xf4
>  wb_writeback+0x160/0x448
>  wb_workfn+0x2f0/0x5dc
>  process_scheduled_works+0x1c8/0x458
>  worker_thread+0x334/0x3f0
>  kthread+0x118/0x1ac
>  ret_from_fork+0x10/0x20
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: fix UAF issue in f2fs_merge_page_bio()
    https://git.kernel.org/jaegeuk/f2fs/c/edf7e9040fc5

You are awesome, thank you!
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